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已知下列反应的反应热为
①CH3COOH(l)＋2O2(g)＝2CO2(g)＋2H2O(l) △H1＝－870.3kJ/mol
②C(s)＋O2(g)＝CO2(g) △H2＝－393.5kJ/mol
③H2(g)＋
O2(g)＝H2O(l) △H3＝－285.8kJ/mol
试计算下述反应的反应热：2C(s)＋2H2(g)＋O2(g)＝CH3COOH(l)
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已知下列反应的反应热为： (1)CH3COOH(l)＋2O2(g)＝2CO2(g)＋2H2O(l)；ΔH1＝－870.3 KJ/mol (2)C(s)＋O2(g)＝CO2(g)；ΔH2＝－393.5 KJ/mol (3)H2(g)＋ 试计算下列反应的焓变 ：2C(s)＋2H2(g)＋O2(g)＝CH3COOH(l)；ΔH | |
| [ ] | |
A． |
－488.3 KJ/mol |
B． |
＋488.3 KJ/mol |
C． |
－245.7 KJ/mol |
D． |
＋245.7 KJ/mol |
O2(g)＝H2O(l)；ΔH3＝－285.8 KJ/mol已知下列反应的反应热为
(1)CH3COOH(l)＋2O2(g)
2CO2(g)＋2H2O(l) ΔH1＝－870.3 kJ·mol－1
(2)C(s)＋O2(g)
CO2(g) ΔH2＝－393.5 kJ·mol－1
(3)H2(g)＋
O2(g)
H2O(l) ΔH3＝－285.8 kJ·mol－1
试计算下述反应的反应热：
2C(s)＋2H2(g)＋O2(g)
CH3COOH(l)
(1)C(s)＋O2(g)===CO2(g) ΔH1＝－393.5 kJ/mol
(2)CH3COOH(l)＋2O2(g)→2CO2(g)＋2H2O(l) ΔH2＝－870.3 kJ/mol
(3)H2(g)＋1/2O2(g)===H2O(l) ΔH3＝－285.8 kJ/mol
则2C(s)＋2H2(g)＋O2(g)===CH3COOH(l)的反应热(焓变)为
B．－488.3 kJ/mol
C．－244.15kJ/mol
D．244.15kJ/mol
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已知下列反应的热化学方程式为： ①C(s)＋O2(g)＝CO2(g)；ΔH1＝－393.5 kJ/mol ②CH3COOH(l)＋2O2(g)＝2CO2(g)＋2H2O(l)；ΔH2＝－870.3 kJ/mol ③H2(g)＋1/2 O2(g)＝H2O(l)；ΔH3＝－285.8 kJ/mol 则反应 2C(s)＋2H2(g)＋O2(g)＝CH3COOH(l)的ΔH为 | |
| [ ] | |
A． |
＋488.3 kJ/mol |
B． |
－ 488.3 kJ/mol |
C． |
－ 244.15 kJ/mol |
D． |
＋244.15 kJ/mol |